lib/uuid.c: change prototype of uuid_guid_get_str()

There's no reason to require an appropriately sized output parameter
for the string, that's error-prone should the table ever grow an
element with a longer string. We can just return the const char*
pointer directly.

Update the only caller accordingly, and get rid of pointless ifdeffery
in the header so that the compiler always sees a declaration and can
thus do type-checking, whether or not PARTITION_TYPE_GUID is enabled
or not.

Signed-off-by: Rasmus Villemoes <rasmus.villemoes@prevas.dk>

diff --git a/disk/part_efi.c b/disk/part_efi.c
index 60b1c1d..2f92266 100644 (file)
--- a/disk/part_efi.c
+++ b/disk/part_efi.c
@@ -247,10 +247,11 @@ void part_print_efi(struct blk_desc *dev_desc)
                uuid_bin = (unsigned char *)gpt_pte[i].partition_type_guid.b;
                uuid_bin_to_str(uuid_bin, uuid, UUID_STR_FORMAT_GUID);
                printf("\ttype:\t%s\n", uuid);
-#ifdef CONFIG_PARTITION_TYPE_GUID
-               if (!uuid_guid_get_str(uuid_bin, uuid))
-                       printf("\ttype:\t%s\n", uuid);
-#endif
+               if (CONFIG_IS_ENABLED(PARTITION_TYPE_GUID)) {
+                       const char *type = uuid_guid_get_str(uuid_bin);
+                       if (type)
+                               printf("\ttype:\t%s\n", type);
+               }
                uuid_bin = (unsigned char *)gpt_pte[i].unique_partition_guid.b;
                uuid_bin_to_str(uuid_bin, uuid, UUID_STR_FORMAT_GUID);
                printf("\tguid:\t%s\n", uuid);

diff --git a/include/uuid.h b/include/uuid.h
index 73c5a89..0c653cb 100644 (file)
--- a/include/uuid.h
+++ b/include/uuid.h
@@ -39,10 +39,8 @@ int uuid_str_to_bin(const char *uuid_str, unsigned char *uuid_bin,
                    int str_format);
 void uuid_bin_to_str(const unsigned char *uuid_bin, char *uuid_str,
                     int str_format);
-#ifdef CONFIG_PARTITION_TYPE_GUID
 int uuid_guid_get_bin(const char *guid_str, unsigned char *guid_bin);
-int uuid_guid_get_str(const unsigned char *guid_bin, char *guid_str);
-#endif
+const char *uuid_guid_get_str(const unsigned char *guid_bin);
 void gen_rand_uuid(unsigned char *uuid_bin);
 void gen_rand_uuid_str(char *uuid_str, int str_format);
 #endif

diff --git a/lib/uuid.c b/lib/uuid.c
index e62d5ca..6cfb6cd 100644 (file)
--- a/lib/uuid.c
+++ b/lib/uuid.c
@@ -122,20 +122,19 @@ int uuid_guid_get_bin(const char *guid_str, unsigned char *guid_bin)
  * uuid_guid_get_str() - this function get string for GUID.
  *
  * @param guid_bin - pointer to string with partition type guid [16B]
- * @param guid_str - pointer to allocated partition type string [7B]
+ *
+ * Returns NULL if the type GUID is not known.
  */
-int uuid_guid_get_str(const unsigned char *guid_bin, char *guid_str)
+const char *uuid_guid_get_str(const unsigned char *guid_bin)
 {
        int i;
 
-       *guid_str = 0;
        for (i = 0; i < ARRAY_SIZE(list_guid); i++) {
                if (!memcmp(list_guid[i].guid.b, guid_bin, 16)) {
-                       strcpy(guid_str, list_guid[i].string);
-                       return 0;
+                       return list_guid[i].string;
                }
        }
-       return -ENODEV;
+       return NULL;
 }
 #endif